The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel

摘要: Maraging steels gain many of their beneficial properties from heat treatments which induce the precipitation intermetallic compounds. We consider here a two-stage heat-treatment, first involving austenitisation, followed by quenching to produce martensite and then an ageing treatment at lower temperature harden maraging steel. It is shown that with suitable choice initial austenitisation temperature, steel can be treated enhanced toughness, strength creep resistance. A combination small angle neutron scattering, scanning electron microscopy, back-scattered diffraction, atom probe tomography were used relate microstructural changes mechanical properties. such characterisation methods necessary quantify this complex alloy, these concluded higher leads greater volume fraction smaller Laves phase precipitates formed during ageing, increase resistance but reduces toughness.